• Title/Summary/Keyword: TRA

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유한요소법을 통한 판에서 시간반전 램파의 공간집속성능 규명 (Investigating the Spatial Focusing Performance of Time Reversal Lamb Waves on a Plate through the Finite Element Method)

  • 최정희;이해성;박현우
    • 한국소음진동공학회논문집
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    • 제21권12호
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    • pp.1120-1131
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    • 2011
  • Researches using time reversal acoustics(TRA) for impact localization have been paid attention to recently. Dispersion characteristics of Lamb waves, which restrict the utility of classical nondestructive evaluation based on time-of-flight information, can be compensated through the application of TRA to Lamb waves on a plate. This study investigates the spatial focusing performance of time reversal Lamb waves on a plate using finite element analysis. In particular, the virtual sensor effect caused by multiple wave reflections at the boundaries of a plate is shown to enable the spatial focusing of Lamb waves though a very small number of surface-bonded piezoelectric(PZT) sensors are available. The time window size of forward response signals, are normalized with respect to the number of virtual active sensors. Then their effects on the spatial focusing performance of Lamb waves are investigated.

TARTAN과 스코틀랜드 복식에 관한연구 (A Study on the Tartan and Scotland Costume)

  • 임영자
    • 복식
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    • 제35권
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    • pp.281-292
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    • 1997
  • Tatan is a symbol of kinship and belonging in Scotland and a badge of identity recognized all over the world. Alongside the powerful historical and national resonance to Tartan for Scots it has been borrowed repeatedly by fashion. The pattern compositionof Tartan check is formed as a typical cross stripes that vertical line and hrizontal line meets rectangulary. And its color is much various and rich than other check pattern. So its magnificient spec-tacle that various all kinds of colors is dyed in cloth is second to name. Today we are as likely to meet tartan in a couturier dress as in a kilt or plaid. Tartan is distinctive in colour style and de-sign. It conveys personality ceremony and drama. All these aspects of its character have contributed to tartan being one of the best-known and best-loved fabrics in the world. In other parts of Europe traditional checked patterns declined and disappeared but in Scotland tartan survived strongly jist as the bagpipes also European flourished Due to geographical and cultural circumstances Scots were able to develop and enhance tartan and its remarkable individuality ensured its sur-vival in spite of adverse political and economic pressures. Tartan has been adopted as the national dress of all Scots. Lowland and High-land providing a powerful form of national cultural and personal identity. Whether tra-ditional or a recent creation whether tra-ditional or a recent creation whether a symbol of nationality or a substitute for nationhood tartan is no mean achievement.

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인스턴트 메신저 : 합리적 행동이론의 실제 (Instant Messenger: Theory of Reasoned Action in Practice)

  • 이정우;한현정
    • 한국경영과학회지
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    • 제29권4호
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    • pp.159-173
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    • 2004
  • Instant Messenger is a communication tool which allows instant real-time connection between parties through Internet Compared to the most popular Internet communication tool. email. the messenger allows people to check network presence of other parties and to connect in real time among multiple parties. Mostly due to the convenience it provides. use of instant messengers has increased tremendously not only for personal purpose but also for business purpose. However. firms are agonizing about the real impact of instant messenger usage among employees. whether the impact is positive or negative in terms of the productivity, Applying the theory of reasoned action (TRA) and technology acceptance model (TAM). this study sets UP perceived ease of use. perceived usefulness and cultural orientation of individuals as antecedents of adoption and use of the messenger application, Also. the impacts of messenger usage are measured as task productivity and intimacy among colleagues. This study presents several findings about the instant messenger, First. perceived ease of use. and usefulness play important roles in raising the adoption level of instant messenger. Also. culture propensity also maintains strong influence towards the actual usage of the messenger. Among cultural variables. innovativeness, supportiveness and outcome orientation reveal strong positive impacts on adoption and use of the messenger. On the dependent side. use of instant messenger seems to have a strong direct impact on task productivity as well as indirect impact through intimacy. Implications are discussed.

왜 트위터러들은 리트윗하는가? 내외적 동기와 사회적 자본의 역할 탐색 (What Makes Twitterers Retweet on Twitter? Exploring the Roles of Intrinsic/Extrinsic Motivation and Social Capital)

  • 이성준
    • 한국산학기술학회논문지
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    • 제15권6호
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    • pp.3499-3511
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    • 2014
  • 본 논문의 주 목적은 동기와 사회적 심리 관점에서 리트윗 행위의도에 영향을 미치는 요소를 살펴보는 것이다. 주요 이론적 근거로는 합리적 행위 이론, 동기 이론 및 사회적 자본 이론을 사용하였다. 온라인 서베이를 통하여 자료를 수집하였으며, 구조 방정식 모델을 이용하여 수집된 자료를 분석하였다. 본 연구의 결과는 리트윗 행위에 대한 태도와 주관적 규범이 리트윗 의도에 유의미한 영향을 미치고 있음을 보여준다. 또한 리트윗 태도는 개인의 내적 동기와 호혜성 규범에 영향을 받고 있음을 보여준다. 더불어 사회적 신뢰는 리트윗 행위 의도에 유의미한 영향을 미치고 있음을 나타낸다. 연구의 결과가 지닌 함의들에 대해서도 토의해본다.

The Effect of Prior Financial Performance on Organizational Reputation and Earnings Management

  • HUYNH, Quang Linh;NGUYEN, Nguyen Van
    • The Journal of Asian Finance, Economics and Business
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    • 제6권4호
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    • pp.75-81
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    • 2019
  • The paper aims to investigate the linkage among prior financial performance, organizational reputation and earnings quality. Firstly, it examines the influence of prior financial performance on organizational reputation and on earnings quality. Secondly, this research explores the moderating role that prior financial performance plays in the causal relationship from organizational reputation to earnings quality. Thirdly, the mediating role of organizational reputation in the effect of prior financial performance on earnings quality is analyzed. The empirical findings show that, prior financial performance positively affects both earnings quality and organizational reputation that in turn partly mediates the causal connection from prior financial performance to earnings quality; whereas prior financial performance imposes a positive moderation in the influence of organizational reputation on earnings quality. This research is expected to provide scholars and practitioners with a thorough understanding of the complex link among prior financial performance, organizational reputation and earnings quality. That helps them to deliver good decisions on the investment of suitable resources in maintaining and enhancing their organizational reputation, which assures a higher quality of reported earnings that in turn improves involved stakeholders' confidence in their firm. This likely leads the firms to gain better performance in the future.

Understanding the Determinants of Behavioral Intentions towards Adoption of Web 2.0 Tools in Workplaces : An Empirical Study

  • Wang, Tao;Jung, Chul-Ho;Chung, Young-Soo
    • Journal of Information Technology Applications and Management
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    • 제18권3호
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    • pp.73-89
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    • 2011
  • More and more employees are implementing the use of emerging Web 2.0 tools such as blogs, wikis, social networks, etc in workplaces. However, their attitudes towards adoption of Web 2.0 tools in workplaces still lack theoretical support. The purpose of this study aims to provide a conceptual examination of the determinants that influence the intention to use Web 2.0 applications in workplaces in Korea. To achieve this objective, this study selected the theory of reasoned action (TRA) as a theoretical basis to explain variation in behavioral intentions. Structural equation modeling was employed to analyze data collected from 269 workers distributed in 5 companies in Korea. In addition, we classified respondents into extroverts and introverts and delineated the different factors for these two types of respondents that affect their intentions to use Web 2.0 tools in workplaces. The findings of this research could provide a theoretical foundation for academics on the validation of technology adoption. This research will also serve as a guideline for service providers in designing the Web 2.0 services.

The Effect of Lending Structure Concentration on Credit Risk: The Evidence of Vietnamese Commercial Banks

  • LE, Thi Thu Diem;DIEP, Thanh Tung
    • The Journal of Asian Finance, Economics and Business
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    • 제7권7호
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    • pp.59-72
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    • 2020
  • This paper examines whether lending structure can lower credit risk by employing econometric techniques of panel data for the Vietnamese banking system at the bank level used by economic sectors from 2011 to 2016. New light is being shed on assessing the impact of each industry's debt outstanding on credit risk. Adopting findings from previous studies, we assess credit risk from two different sources, including loan loss provision and non-performing loan. Moreover, we also focus on observing lending structure in many different aspects, from concentrative levels to the short-term and long-term stability levels of lending structure. The Generalized Method of Moments (GMM) estimator was applied to analyze the relationship between concentration and banking risks. In general, the results show that lending concentration may decrease credit risk. It is interesting to observe that the Vietnamese commercial bank lending portfolios have, on average, higher levels of diversity across different sectors. In particular, the increase in hotel and restaurant lending contributes to decrease credit risk while the lending portfolios of banks in agriculture, electricity, gas and water increase credit risk. This study suggests the need for further analysis and research about portfolio risks in lending activities for maintaining efficiency and stability in the commercial banking system.